[Bug 107543] Video cutout on Kaby Lake U processors.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107543

--- Comment #26 from phil.smith at adder.com ---
> I could see multiple hot-plug events and under-runs around those events, Is hot
> plug/un-plug is involved in test scenario or this is monitor/cable problem which
> is triggering hotplug?

We have seen the issue under a variety of different circumstances including:
- Kicking off a Linux kernel compile.
- Shortly after boot into Wayland/Weston.
- Wayland/Weston idling.
- After bringing a monitor out of standby.

I.e. Physical hot-plug/unplug are not specifically required to trigger the
issue.

We have not been able find a reliable reproduction case and sometimes we can go
over a week without a failure.

> Is it particular 4K monitor in which issue is reproducible or all 4K monitor are
> causing this issue. Can you please try with some other 4K monitor to see if
> issue is still reproducible.

The issue has been observed with at least three different 4k monitors (Eizo,
Samsung and LG). We believe it has never occurred with a HD monitor.

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